﻿using System;
using System.Windows;
using System.Windows.Data;

namespace SqlMetalIncludeGUI.Converters
{
	/// <summary>
	/// Magic converter for converting booleans to <see cref="Visibility"/>
	/// </summary>
	/// <remarks></remarks>
	public class BooleanToVisibilityMultiConverter : IMultiValueConverter
	{
		/// <summary>
		/// Converts source values to a value for the binding target. The data binding engine calls this method when it propagates the values from source bindings to the binding target.
		/// </summary>
		/// <param name="values">The array of values that the source bindings in the <see cref="T:System.Windows.Data.MultiBinding" /> produces. The value <see cref="F:System.Windows.DependencyProperty.UnsetValue" /> indicates that the source binding has no value to provide for conversion.</param>
		/// <param name="targetType">The type of the binding target property.</param>
		/// <param name="parameter">The converter parameter to use.</param>
		/// <param name="culture">The culture to use in the converter.</param>
		/// <returns>A converted value.If the method returns null, the valid null value is used.A return value of <see cref="T:System.Windows.DependencyProperty" />.<see cref="F:System.Windows.DependencyProperty.UnsetValue" /> indicates that the converter did not produce a value, and that the binding will use the <see cref="P:System.Windows.Data.BindingBase.FallbackValue" /> if it is available, or else will use the default value.A return value of <see cref="T:System.Windows.Data.Binding" />.<see cref="F:System.Windows.Data.Binding.DoNothing" /> indicates that the binding does not transfer the value or use the <see cref="P:System.Windows.Data.BindingBase.FallbackValue" /> or the default value.</returns>
		/// <remarks></remarks>
		public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
		{
			var visible = Visibility.Visible;

			foreach (object item in values)
			{
				if (item is bool && !(bool)item)
					visible = Visibility.Collapsed;
				else if (item is bool? && ((bool?)item) != true)
					visible = Visibility.Collapsed;
			}

			return visible;
		}

		/// <summary>
		/// Converts a binding target value to the source binding values.
		/// <para>NB: This functionality has not been implemented.</para>
		/// </summary>
		/// <param name="value">The value that the binding target produces.</param>
		/// <param name="targetTypes">The array of types to convert to. The array length indicates the number and types of values that are suggested for the method to return.</param>
		/// <param name="parameter">The converter parameter to use.</param>
		/// <param name="culture">The culture to use in the converter.</param>
		/// <returns>An array of values that have been converted from the target value back to the source values.</returns>
		/// <exception cref="System.NotImplementedException"></exception>
		/// <remarks>This functionality has not been implemented.</remarks>
		public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
		{
			throw new NotImplementedException();
		}
	}
}
